Date: Sun Mar 29 10:28:16 2009 Back to Contents ------------------------------------------------------------------------

Author: Urs Lauterburg

Subject: Re: Electrostatic analog voltmeter

Post:

Simcha,

These fine devices are very rare by now and that's why I guard my
fine, large, antique analog electrostatic voltmeter for 0-5kV from
Gossen like a treasure. It's still in very good shape and does the
job well.

What you may could do is to use an OpAmp with a high input resistance
as an integrator with a feedback capacitor to hold the charge and
drive a normal voltmeter with it. Of course calibration to absolute
units may be a bit tricky and less obvious than with a direct
measurement of the mechanical displacement of two charged plates as
is done within the old fashioned static voltmeters.

Some manufacturers offer instruments to measure static electricity
the ''modern'' way e.g.:

http://www.smcworld.com/2002/npp/npp_view_e.php3?&KeyNo=NPP-06-6

Don't know about their performance/accuracy though.

Regards from pretty nearby

Urs

Urs Lauterburg
Physics demonstrator (not banker)
Physikalisches Institut
University of Bern
Switzerland


>Hi Taplers,
>
>I'm looking for Electrostatic analog voltmeter for 1,3,6 and 10Kv or more
>(similar to the GOSSEN panel voltmeters 144x144 sold few years ago by
>Leybold-Didactic) for our new lobby display that I'm working on.
>
>I already have few electrostatic meters manufactured by GOSSEN and would
>like to buy more. Any suggestions will be appreciate.
>
>
>Thanks, Simcha


From tap-l-owner@lists.ncsu.edu Sun Mar 29 10:28:16 2009